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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0c82e3f1713c3ab22e97092a34daece6c18b1534d3526331261879aca954ab' 
  AND token = 'G5i++G+Oon32Mt3wTcxRTI/Ai+XNlR5BTtrSbTDWu5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}